Hi McMonkey,
It`s been a very long time since anyone had posted on this thread but it's really nice to hear you seem to be enjoying the scenario. As I recall, I put a lot of effort in trying to make it competitive and interesting.
I imagine you selected Tunnel Complex I to play first. One thing I tried to do in my design was make it so that a player will never play the same exact scenario twice by 1) creating three different tunnel complex systems to choose from at the start and 2) have many of the initial japanese units set up randomly each time the player starts a new game.
Let me know how the game ends.